First off, The lights. They stand out so much in this picture! They make like a gradient kinda like picture. It looks almost like there's going to be some portal in the middle of the sky!

Second, The stars. It makes it look sparkly and it doesn't cover up the aurora. It kinda makes it pop out a little.

Last, the trees. The position of the trees look amazing! It doesn't really cover a lot of this picture but the trees look like the're trying to reach up for the aurora because of how it's so beautiful.

Your photography is amazing! I hope you keep taking more pictures for all of us on Deviantart!